Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e41bda6c46a5e6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 04:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec0d4880a8358372d98c0f1486efafd6 SHA-1: 1ad64bd499df0c405d16e065772257c8fc05e5fa SHA-256: a3e41bda6c46a5e66874fdf5fcb3ce83ce63c4634300e9e8a70c79b0bfbfe3c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.77ice.com/upload/files/gimedoxixe.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/fuwefelefivutefokifewisi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/sesaruzi.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/4894445233.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/valilibenapisokeke.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98704230511.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/xoxaje.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/46183854834.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/mafuzizaxenafodu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/falamemixizu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/80767713028.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/gefixarokufamul.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/52705769789.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dbc7c0d1---26696544275.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/voboxa.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zulimumukadurolozop.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/pamajabibujurexukarezab.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vojusotitetelosowafoviw.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/15241532721.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/sorisawudipagijuji.pdfIn PDF document text
    • https://kueapem.com/contents/files/lazopu.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/lajedopek.pdfIn PDF document text
    • http://cecev.com/stockages/files/88915058310.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb8ba2661a83d337a758c79c0d0184e0/75866781054.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/51804962797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=battle+of+warships+god+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 18696 bytes
SHA-256: fdf434686ed18f1e1faa4fb7034f60c101e762a7816d3e11f38cc2a8eb851c1f
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 11072 bytes
SHA-256: be7e56140d4792d6bde42697c97cab684f7b3bb9191f3cb90f34fcf2c148f068
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1